blob: f777d4084534cea361cd0c2b899befc0321026ff [file] [log] [blame]
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
/// @assertion A class S is a superclass of a class C iff either:
/// - S is the superclass of C, or
/// - S is a superclass of a class S0 and S0 is a superclass of C.
/// @description Checks that the superclass-subclass relationship is transitive.
/// @author rodionov
import "../../../Utils/expect.dart";
class A {}
class B extends A {}
class C extends B {}
class D extends C {}
main() {
D d = new D();
Expect.isTrue(d is B);
Expect.isTrue(d is A);
Expect.isTrue(d is Object);